SOLUTION: The variable z varies jointly as the square of x and the square root of y. If z=7.2 when x=3 and y=16, find z when x=5 and y=4.
I know that there are a system of equations that
Algebra ->
Coordinate Systems and Linear Equations
-> SOLUTION: The variable z varies jointly as the square of x and the square root of y. If z=7.2 when x=3 and y=16, find z when x=5 and y=4.
I know that there are a system of equations that
Log On
Question 300690: The variable z varies jointly as the square of x and the square root of y. If z=7.2 when x=3 and y=16, find z when x=5 and y=4.
I know that there are a system of equations that could be used to solve this word problem, but I am at a loss for where to start and I can't seem to see the connections between the variables. Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! The variable z varies jointly as the square of x and the square root of y.
If z=7.2 when x=3 and y=16, find z when x=5 and y=4.
:
Find k when; z=7.2 when x=3 and y=16,
7.2 = 9*4*k
7.2 = 36k
k =
k = .2
:
The equation
:
find z when x=5 and y=4.
z = .2*4*2
z = 1.6
